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Data source: Environmental Protection Agency
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Air quality in Grand Rapids, Michigan correlates with...

Variable	Correlation	Years	Has img?
Master's degrees awarded in Legal professions and studies	r=0.95	10yrs	No
Public Library Website Visits in the UK	r=0.94	8yrs	No
Portion of all US dairy skim-solids allocated to the production of cheese (other than cottage cheese)	r=0.88	22yrs	No
Jet fuel used in Sao Tome and Principe	r=0.87	22yrs	No
Biomass power generated in Rwanda	r=0.87	22yrs	No
Annual US household spending on education	r=0.87	21yrs	No
Jet fuel used in Samoa	r=0.87	22yrs	No
The number of registered nurses in Michigan	r=0.86	18yrs	No
Total Revenue of the NFL Teams	r=0.86	20yrs	No
Wind power generated in Czechia	r=0.86	22yrs	No
US average dairy skim-solid content of cheese (other than cottage cheese)	r=0.85	22yrs	No
The number of mechanical engineers in Michigan	r=0.85	20yrs	No
Total employee count at Continental AG	r=0.85	24yrs	No
Biomass power generated in India	r=0.84	23yrs	No
Annual US household spending on telephone services	r=0.84	23yrs	No
Associate Professor salaries in the US	r=0.84	13yrs	Yes!
Assistant Processor salaries in the US	r=0.84	13yrs	No
The number of paralegals in Michigan	r=0.84	18yrs	No
Biomass power generated in Zambia	r=0.84	22yrs	No
US dairy skim solids used to produce sour cream	r=0.84	22yrs	No
US milk fat used to produce sour cream	r=0.84	22yrs	No
US production of sour cream	r=0.83	22yrs	No
Professor salaries in the US	r=0.83	13yrs	No
Instructor salaries in the US	r=0.83	13yrs	No
GMO use in cotton	r=0.83	23yrs	No
GMO use in cotton	r=0.83	23yrs	No
U.S. direct investment abroad	r=0.83	22yrs	No
US milk fat used to produce yogurt	r=0.82	22yrs	No
University Lecturer salaries in the US	r=0.82	13yrs	No
US production of yogurt, nonfrozen	r=0.82	22yrs	No
The number of property association managers in Michigan	r=0.82	20yrs	No
GMO use in corn	r=0.82	24yrs	No
Wind power generated in Taiwan	r=0.82	22yrs	No
Annual US household spending on laundry and cleaning supplies	r=0.81	23yrs	No
UK Service Retail Price Index	r=0.81	19yrs	No
US household spending on rented dwellings	r=0.81	23yrs	No
Google searches for 'i have the flu'	r=0.81	20yrs	No
US production of cheese (other than cottage cheese)	r=0.81	22yrs	No
US household spending on health insurance	r=0.81	23yrs	No
Biomass power generated in Slovenia	r=0.81	23yrs	No
US household spending on healthcare	r=0.8	23yrs	No
Annual US household spending on electricity	r=0.8	23yrs	No
GMO use in corn	r=0.8	24yrs	No
Economic output of Washington metro area	r=0.8	21yrs	No
GMO use in corn grown in Michigan	r=0.8	24yrs	No
Hollister retail store count worldwide	r=0.8	23yrs	No
Annual US household spending on utilities	r=0.79	23yrs	No
Adidas Group's Global Net Sales	r=0.79	23yrs	No
Customer satisfaction with TJ Maxx	r=0.79	14yrs	No
US Bottled Water Consumption per Person	r=0.78	24yrs	No
US per-person consumption of bottled water	r=0.78	24yrs	No
The number of interpreters and translators in Michigan	r=0.76	20yrs	No
Total Federal Construction Expenditure in the United States	r=0.76	24yrs	No
Customer satisfaction with T-Mobile	r=0.75	17yrs	No
RTX Corp's stock price (RTX)	r=0.74	22yrs	No
Ticket prices at North American movie theaters	r=0.74	22yrs	No
Customer satisfaction with Costco	r=0.74	22yrs	No
Automotive recalls issued by Keystone RV Company	r=0.72	25yrs	No
Automotive recalls issued by Toyota	r=0.71	23yrs	No
Fomento Econ's stock price (FMX)	r=0.71	22yrs	No
Simon Property Group's stock price (SPG)	r=0.7	22yrs	No
The distance between Saturn and the Sun	r=0.7	44yrs	No
The distance between Saturn and Mercury	r=0.69	44yrs	No
The distance between Saturn and Earth	r=0.69	44yrs	No
The distance between Saturn and the moon	r=0.69	44yrs	No
Google searches for 'flights to Antarctica'	r=0.69	20yrs	No
The distance between Saturn and Venus	r=0.68	44yrs	No
Customer satisfaction with Southwest Airlines	r=0.65	28yrs	No
AIG's stock price (AIG)	r=-0.8	22yrs	No

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Air quality in Grand Rapids, Michigan also correlates with...

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^{What is Sys. Score?} You caught me! While it would be intuitive to sort only by "correlation," I have a big, weird database. If I sort only by correlation, often all the top results are from some one or two very large datasets (like the weather or labor statistics), and it overwhelms the page.

I can't show you *all* the correlations, because my database would get too large and this page would take a very long time to load. Instead I opt to show you a subset, and I sort them by a magic system score. It starts with the correlation, but penalizes variables that repeat from the same dataset. (It also gives a bonus to variables I happen to find interesting.)